Keyboard



FIG. 1 is a front perspective view of a keyboard showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the rectangular regions at the top and bottom of the keyboard is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 